If you have a discount code, you need to activate it in your Account portal before you're billed for your next box in order for your discount to apply to your order. Here's how to do it:
1. Log into your Account portal
2. Click on Manage subscriptions in the menu on the left side of the screen
3. On the right side of the screen, select the Manage discounts option
4. Type in your discount code in the text field where it says, "Enter discount here". The conditions of your discount will automatically appear if your discount is valid
5. Tap on the button Redeem code to immediately activate your discount